Mr Eaten's Open Skies v1.0.1 Monarch compatibility test 2

Second Monarch compatibility test prerelease.

Installer changes since test 1:

• If run from the extracted installer folder, it now prompts for the Sunless Skies folder instead of failing/closing.
• Writes install-log.txt next to install.bat on success or failure.
• Keeps the window open on cancellation/failure paths.
• Guards against unreadable installer choices instead of silently choosing an option.

Use option 2 for Monarch/Furthest Frontiers installs.